Case Studies

Quality-adjusted life years (QALYs) are a measure of the life expectancy of a patient, weighted by a quality of life score. Generally QALYs are calculated using a naive method which is inefficient and can introduce bias. An improved method uses the statistical technique of joint modelling.

In the absence of an off-the-shelf sample size calculator, we can use a simulation approach to explore the effects of a range of sample sizes on the power to detect a desired treatment effect with sufficient confidence.

States are required to monitor and protect plants and animals listed as European Protected Species. However, species data are often ad hoc and vary considerably in their quality and coverage. In these cases, species distribution models can be applied to obtain useful estimates from the limited data available.

Select recently had the opportunity to work with Conwy County Borough Council on the analysis of their Recycle More Survey. The council wanted to better understand attitudes towards recycling in the county and to understand the potential impact of possible changes to bin collection frequency.